Tool-holder



( O Model.)

R. J-. SOHEMMEL,

TOOL HOLDER.

INVENTOR fi m W M ATTORNEYS WITNESSES flgm/ N. PEYERS. PhMwLflhn npMr. Washington, D. C-

U ITE STATES,

ATENT FFICE.

RUDOLPH J. SCHEMMEL, OF \VAPAKON ETA, OHIO.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 299,424, dated May 27, 1884.

Application filed April 5, 1884. (No model.)

and I do declare the following to be a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure lof the drawings is a representation of this invention, and is a perspective view. Fig. 2 is a vertical section.

This invention has relation to improvements in tool-holders; and it consists in the construction and novel arrangement of devices, as will be hereinafter more fully set forth, and particularly pointed out in the claim appended.

In the accompanying drawings, the letter A designates the hollow tang portion of the shank, having a cylindrical recess or hearing, B, bored longitudinally therein. The outer lip of this tang-bearing is serrated or crownshaped, as shown at G, the serration being V form.

D represents a threaded perforation made in the side wall of the'tang-bearing. The inner end of the cylinder is formed with prongs P. to engage the stock and hold the cylinder firmly therein,

E is the rotary portion of the shank which carries the socket F. This portion is formed with a cylindrical slide-bearing, G, adapted to enter the hollow of the tang and to extend nearly to the bottom thereof. Around the middle of the cylinder-bearing G is formed an annular groove, H, into which the inner end of a stop-screw, I, projects, when such screw is turned through the threaded perforation of the tang-wall. The annular grooveH is made wider than the diameter of the projecting end of the screw which enters said groove, the excess being a little more than the length of one of the serrations of the lip of the tang-bearlng.

K represents a collar on the socket-shank, having itsinner edge, J, serrated, as shown, the form of the serrations being similar to those of the lip of the tang-bearing. When the cylinder-bearing is seated in the hollow of the tang, the lip of the tang-bearing and the collar of the shank form a clutch; and in order to provide for disengagement of the members of theclntch, the socket-shank is given longitudinal play equal to the excess of the width of the annular groove over the diameter of the stop-screw. The end of the socketshank is formed with a small central stud, V, which is designed to engage one end of a spiral spring, which is seated in the bottom of the tang-bearing. The object of this screw is to keep the socket-shank pressed outward from the tang-bearing, so that the clutch serrations are disengaged from each other. The socket;shank, therefore, has free rotary motion of reciprocation.

\Vhen a bit is seated in the socket and the instrument is put in operation, the pressure forces the socket-shank back to the tang-bearing, and the clutch -serrations engage each other, so that the bit can be turned. When the pressure is relieved, there is a disengagement of the clutch, and the stock carrying the tang-bearing can be turned back without shifting the hand-grasp thereon.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s

The tool-holder herein described, consisting of the cylindrical tang-bearing A, having its outer end provided with the serrations O and its inner end provided with the prongs P, to

engage the recessed handle, as shown, the rotary portion E, having its inner end provided with serrations to engagethe serrations of the tang-bearing, and its outer end provided with a socket, F, carrying a set-screw, and the cylindrical socketshank having at its inner end a stud, V, which is seated in the tang portion against a spring therein, the said shank having an annular recess, H, and the tang-bearing having a threaded perforation, D, for the reception of the stop-screw I, all adapted to operate substantially as specified.

In testimony whereof I afiix my. signature in presence of two witnesses.

RUDOLPH J. SOHEMMEL. Witnesses:

E. S. NIoHoLs, O. A. Srunvn. 

